Method and apparatus for equalization in transmit and receive levels in a broadband transceiver system

ABSTRACT

A method ( 100 ) for amplitude equalization in transmit and receive levels in a base station wideband transceiver ( 50 ) includes the step of assigning ( 102 ) a plurality of transmit and receive carrier frequencies to the base station wideband transceiver and the step of flattening ( 104 ) the power in the plurality of transmit and receive carrier frequencies in the plurality of base wideband transceivers using software amplitude pre-distortion.

CROSS REFERENCE TO RELATED APPLICATIONS

This application claims the benefit of U.S. Provisional Application60/175,351 entitled, “EQUALIZATION IN TRANSMIT AND RECEIVE LEVELS IN ABROADBAND TRANSCEIVER SYSTEM,” filed Jan. 10, 2000, the entirety ofwhich is incorporated herein by reference. Notice: More than one reissueapplication has been filed for the reissue of U.S. Pat. No. 7,047,042.The present application is a divisional reissue application of reissueapplication Ser. No. 13/539,052, filed Jun. 29, 2012 and is a reissueapplication of U.S. Pat. No. 7,047,042, which claims the benefit of U.S.Provisional Application 60/175,351 entitled “EQUALIZATION IN TRANSMITAND RECEIVE LEVELS IN A BROADBAND TRANSCEIVER SYSTEM,” filed Jan. 10,2000, the entirety of which is incorporated by reference.

BACKGROUND OF THE INVENTION

1. Field of the Invention

This invention relates to wireless communication systems and inparticular to a method and apparatus for improved accuracy in equalizingtransmit and receive power levels in a base station transceiver toreduce distortion effects experienced on multiple receive and transmitchannels.

2. Description of Relevant Art

The ever increasing need for wireless communication services such asCellular Mobile Telephone (CMT), Digital Cellular Network (DCN),Personal Communication Services (PCS) and the like, typically requirethe operators of such systems to serve an increasing number of users ina given service area. As a result, certain types of base stationequipment, including high capacity broadband transceiver systems (BTS),have been developed which are intended to service a relatively largenumber of active mobile stations in each cell.

In a broadband transceiver system (BTS), such as the current AdaptaCellBTS produced by AirNet Communications Corporation of Melbourne, Fla.,multiple RF channels are transmitted and received concurrently. Thefrequency response, or gain, for each of these multiple RF channelsreceived by the BTS differ as a result of system imperfections, such aspassband ripple or filter roll-off, caused by the components of an RFtransceiver in the BTS. The gain difference between these RF channelscan be as large as plus or minus 3 dB. This is not a problem for BTSsystems employing single channel radio transmitters and receivers ratherthan broadband transceivers, because single channel radios allow for thegain of each RF channel transmitted and received by the BTS to be setindividually, rather than a single gain being added universally acrossall RF channels in the BTS.

It is desirable to have the gain be equivalent from RF channel to RFchannel, because the GSM cellular communications protocol, among others,requires in its specifications that the receive side of a given BTScalculate a specific receive signal strength level with only plus orminus 2 dB of variation. When there is a large amount of variation inthe receive signal of an RF carrier, it is difficult to determine theReceive Signal Strength Indication (RSSI) of a mobile stationtransmitting on the RF channel to the BTS. Without knowledge of theRSSI, it is difficult for the BTS to maintain uplink power control ofthe mobile station. A loss in uplink power control can result in theloss of signals transmitted by the mobile, unnecessary gain control bythe BTS, and a premature expenditure of mobile battery power. Inaddition to maintaining receive power levels, there are requirements forthe BTS to maintain a specific transmit power level across the RFchannels of the transceiver as well. The transmit power level must alsobe maintained in order to prevent the expansion or shrinking of the cellsize of the BTS, and for efficiency in the use of transmit power.

The traditional solution to this problem of non-uniform frequencyresponse across RF channels is the use of multiple narrowband singlecarrier radios to cover the spectrum of RF channels received andtransmitted by the BTS, setting the gain on each radio individually forthe respective RF channel in a manner in which all RF channels have auniform frequency response. Another solution that has been used inbroadband systems to normalize this frequency response across RFchannels has been to take a sampling of average roll-off and ripplevalues among a cross-section of transceivers. These average roll-off andripple values were then used to set up a static power table across thetransmission range. The static power table did not change for individualtransceivers, and was used to artificially flatten the transmit andreceive power levels for every transceiver in a BTS on the basis of theaverage filter roll-off and passband ripple values contained therein.Neither of these solutions provide optimal use of a broadbandtransceiver having uniformly flat (or normalized) transmit and receivepower frequency responses in a given BTS. Thus, a need exists for a basetransceiver system that discretely normalizes on every base transceiverwithin the BTS the frequency response on a channel-by-channel basis.

SUMMARY OF THE INVENTION

In a first aspect of the present invention, a method for equalization intransmit and receive levels within a base station wideband transceiveris disclosed. The base station wideband transceiver preferably operatesin a wireless cellular communications system having a plurality of basestation wideband transceivers that communicate with mobile subscribers.Preferably, the method comprises the step of assigning a plurality oftransmit and receive carrier frequencies to the base station widebandtransceiver and the step of flattening the power in the plurality oftransmit and receive carrier frequencies in the base station widebandtransceiver using software amplitude pre-distortion.

In a second aspect of the present invention, a broadband radio frequencybase station transceiver capable of receiving and transmittingsimultaneously on multiple frequencies comprises a receiver coupled toan plurality of analog-to-digital converters and a transmitter coupledto a digital-to-analog converter. The base station transceiverpreferably further comprises at least one digital signal processorprogrammed to discretely flatten the power in each of the plurality oftransmit and receive carrier frequencies using software amplitudepre-distortion.

In a final aspect of the present invention, a wireless cellularcommunications system with improved equalization in transmit and receivelevels, comprises a plurality of wideband transceivers communicatingwith mobile subscribers, wherein a plurality of transmit and receivecarrier frequencies are assigned to the plurality of widebandtransceivers. Each of the wideband transceivers comprises a receivercoupled to an plurality of analog-to-digital converters, wherein theanalog-to-digital converters provide a plurality of digitized signals toa corresponding plurality of digital channelizers, and a transmittercoupled to a digital-to-analog converter, wherein the digital-to-analogconverter receives an analog signal from a multi-channel digitalcombiner. The wireless cellular communications system further comprisesa first digital signal processor programmed to discretely flatten thepower in each of the plurality of receive carrier frequencies usingsoftware amplitude pre-distortion and a second digital signal processorprogrammed to discretely flatten the power in each of the plurality oftransmit carrier frequencies using software amplitude pre-distortion.

BRIEF DESCRIPTION OF THE DRAWINGS

Features and advantages of the present invention will become apparent tothose skilled in the art from the following description with referenceto the drawings, in which:

FIG. 1 is a block diagram of an exemplary base transceiver station inaccordance with the present invention.

FIG. 2 is a flow chart illustrating a method for equalization inaccordance with the present invention.

FIG. 3 is a flow chart illustrating the step of flattening in accordancewith the present invention.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

Referring to FIG. 1, a broadband BTS base station wideband transceiver50 is illustrated, which comprises a receiver section 56 and atransmitter section 55. It will be readily appreciated by those skilledin the art that the particular transceiver architecture shown is notcritical. Accordingly, the invention disclosed herein is not intended tobe so limited. Receiver section 56 preferably includes antennas 68, 70and a wideband receiver 51 capable of receiving a plurality of radiofrequency carrier channels. Signals from the received channels caninclude new power requests, power adjustment requests, and trafficchannel data from mobile users 19. The term “wideband,” as used herein,is not limited to any particular spectral range, and it should beunderstood to imply a spectral coverage of multiple frequency channelswithin the communication range over which a wireless communicationsystem may operate (e.g. 5 or 12 MHz). Narrowband, on the other hand,implies a much smaller portion of the spectrum, for example, the widthof an individual channel (e.g. 30 or 200 kHz).

The output of the wideband receiver 51 is downconverted into amulti-channel baseband signal that preferably contains the contents ofall of the voice/data carrier frequency channels currently operative inthe communication system or network of interest. This multi-channelbaseband signal is preferably coupled to high speed A-D converters 52-1and 52-2 operating in parallel for diversity receive capability. Whereno diversity capability is required, a single A-D 52-1 could beutilized. Additionally, more than one parallel leg may be required forsectorized applications. Hence, it should readily be appreciated by oneskilled in the art that the presence of a second parallel processing legis not intended to be a limitation on the instant invention. The dynamicrange and sampling rate capabilities of the A-D converter aresufficiently high (e.g. the sampling rate may be on the order of 25Mega-samples per second (Msps)) to enable downstream digital signalprocessing (DSP) components, including Discrete Fourier Transform (DFT)or Fast Fourier Transform (FFT) channelizers 53-1 and 53-2, to processand output each of the active channels received by receiver 56.

The channelized outputs from the A-D converters are further processed toextract the individual channel components for each of the parallelstreams. FFT channelizers 53-1 and 53-2 are preferably used to extractrespective narrowband carrier frequency channel signals from thecomposite digitized multi-channel signals. These narrowband signals arerepresentative of the contents of each of the respective individualcarrier frequency communication channels received by the widebandreceiver 51. The respective carrier frequency channel signals arecoupled via N output links through a common control and data bus 61 torespective digital signal processing receiver units 63-1 . . . 63-N,each of which demodulates the received signal and performs anyassociated error correction processing embedded in the modulated signal.In the case where the received signals are destined for the publicswitched telephone network (PSTN), these demodulated signals derivedfrom the digital signal processing receiver units 63 can be sent via acommon shared switching bus 54 to a telephony carrier interface, forexample, T1 carrier digital interface 62, of an attendant telephonynetwork (not shown).

The transmitter section 55 includes a second plurality of digital signalprocessing units, specifically, transmitter digital signal processingunits 69-1 . . . 69-N, that are coupled to receive from the telephonynetwork respective ones of a plurality of channels containing digitalvoice/data communication signals to be transmitted over respectivelydifferent individual radio frequency carrier channels of themultichannel network. Transmitter digital signal processing units 69modulate and perform pre-transmission error correction processing onrespective incoming communication signals, and supply processed radiofrequency carrier channel signals over the common bus 54 to respectiveinput ports of an inverse FFT-based multi-channel digital combiner unit58. The combiner 58 outputs a composite multi-channel digital signal.This composite signal is representative of the contents of a widebandsignal which contains the respective narrowband carrier frequencychannel signals output from the transmitter digital signal processingtransmitter units 69. A composite signal generated from the output ofthe multi-channel combiner unit 58 is then processed by thedigital-to-analog (D-A) converter 59. The analog output of D-A converter59 is coupled to a wideband (multi-carrier) transmitter unit 57, whichcan include or have a separate multi-carrier high power amplifier (HPA)57A. The transmitter unit 57 transmits a wideband (multi-carrier)communication channel signal defined by the composite signal output ofthe inverse fast Fourier transform-based digital combiner unit 58. Theoutput of the HPA 57A is then coupled to antenna 68 for transmission.

A central processing unit (CPU) controller 64 is provided forcoordinating and controlling the operation of the BTS 50. For example,the CPU 64 can include a control processing unit, memory, and suitableprogramming for responding to transmit power control requests receivedfrom mobile transceiver units. CPU 64 can preferably selectively controltransmit power levels for each TDMA communication channel on atimeslot-by-timeslot basis. The CPU 64 may be a microprocessor, DSPprocessor, or micro controller having firmware, software, or anycombination thereof.

DSPs 63 can extract encoded information from each of the narrowbandcarrier frequency channel signals. Information for each of thesechannels can be stored in a memory such as shared memory 75 through thecommon control and data bus 61. The memory could also be flash memorywithin the DSP processors for example. CPU 64, under firmware and/orsoftware control, can then access the shared memory 75 through bus 61.After the information for each channel in the received signal isprocessed and separated, DSPs 63 can store the control channel data inthe shared memory 75. CPU 64 can then access shared memory 75 toretrieve the control channel data. CPU 64, under software and/orfirmware control, can then use this data, for example, as an input to acontrol algorithm. The output from the algorithm can be stored in sharedmemory 75 for later use.

The invention described uses a GSM air-interface. However, thisinvention could also apply to other TDMA structures such as IS-136 andIS-54, CDMA, or any other wireless protocol.

It should be understood that the examples and embodiments describedherein are for illustrative purposes only and that various modificationsor changes in light thereof will be suggested to persons skilled in theart and are to be included within the spirit and purview of thisapplication. The invention can take other specific forms withoutdeparting from the spirit or essential attributes thereof for anindication of the scope of the invention.

Referring to FIG. 2, a method 100 for equalization of transmit andreceive levels in a base station wideband transceiver is shown. At step102, transmit and receive frequencies are assigned to the broadbandtransceiver. Ideally, the transmit and receive frequencies are generallyflat across all usable RF carriers (or Absolute Radio Frequency ChannelNumbers (ARFCNs)) in accordance with the present invention. As shown instep 104, flattening of the transmit and receive frequencies isgenerally performed in software within the digital signal processors (63and 69 of FIG. 1) using software amplitude pre-distortion. The softwareamplitude pre-distortion should compensate at least for one or more ofthe following effects including distortion introduced by thedigital-to-analog converters in the transmit path of the base stationwideband transceiver 50, narrowband ripple and filter roll-offdistortion typically caused by narrowband surface acoustic wave (SAW)filters at intermediate frequencies (IF), and wideband ripple and filterroll-off distortion caused by wideband SAW filters at radio frequencies(RF) in both the receive and transmit paths found in the receiver 51 andthe transmitter 57 (see FIG. 1).

This flattening of carrier frequencies or ARFCNs preferably normalizesall Broadband RF Transceivers (BRTs) to have one nominal output levelfor a given input level for each transmitted RF carrier. This flatteningshould have good accuracy at normal temperature levels. For example, thenominal output level can be equivalent to approximately +11 dBm when theinput level is approximately −4 dBm, and the accuracy of this flatteningcan be equivalent to approximately plus or minus 0.25 dB.

Flattening of transmit and receive signal power in a BTS in accordancewith the present invention can be performed preferably using two steps.First, flattening can be performed to account for Digital-to-AnalogConverter (D/A) effects caused by Sin(X)/X rolloff by D/A 59 forexample. Second, flattening can be performed to account for specific BRTRF frequency response. In the first step, to account for the effects ofthe D/A of a given BTS on transmit and receive power, flatteningcoefficients for the D/A can be stored in a memory location within theBRT. These flattening coefficients for D/A's are generic (based uponSin(X)/X rolloff), and are universal across all BRTs within a BTS. Theseflattening coefficients may include 25 broadband converter modules (BCM)channel coefficients. In the second step, flattening is performed on theRF and IF carriers to account for both the wideband and narrowbanddistortion of the BRT RF filter response. First, flattening is performedto account for narrowband ripple and filter roll-off, among other typesof distortion. Second, flattening is performed to account for widebandripple and filter roll-off, among other types of distortion. Thenarrowband bandwidth will generally be a 5 MHz intermediate frequencybandwidth, whereas the wideband bandwidth is generally the full 60 MHzof radio frequency spectrum allocated to a cellular communicationsprovider.

With reference to FIG. 3 in a specific embodiment of the presentinvention, the flattening step 104 could also comprise the step 110 ofmaking narrowband channel measurements using an automated broadbandradio frequency transceiver test to determine a set of coefficients foreach narrowband channel and/or to determine a set of coefficients forthe wideband channel (which can be performed by stepping through thechannels in the wideband bandwidth). There are separate sets ofcoefficients for narrowband and wideband flattening to account for theseparate types of distortion experienced caused by narrowband SAWfilters at IF and wideband SAW filters at RF, respectively. Ideally, theautomated broadband radio frequency transceiver test creates 25narrowband coefficients and 300 wideband coefficients for a 60 MegaHertzbandwidth having 200 kHz channels. As shown in step 112, thecoefficients can be optionally stored in a memory of a transceivermicroprocessor module in each of the plurality of base station widebandtransceivers or other suitable memory location within the transceiver.Preferably, the wideband coefficients and the narrowband coefficientsare stored in a look-up table in memory, wherein each base stationwideband transceiver will have its own set of wideband and narrowbandcoefficients. At step 114, a corresponding gain for each individualradio frequency is set based on the narrowband and wideband coefficientsdetermined from the automated broadband radio transceiver test. Thus, insteps 116, 118, and 120, the coefficients are applied to each of thereceive and transmit signals to compensate for the distortion effectsresulting from digital-to-analog converters and/or from narrowbandripple and filter roll-off and/or wideband ripple and filter roll-off.

In a BTS in accordance with the present invention, an automated BRT TestSystem (BRTTS) can preferably collect BRT narrowband flatness data for aspecific BRT, and will write that data to a pre-defined BRT storagelocation. This data will be gathered for each 5 MHz narrowband IFpassband in a 60 MHz wideband RF bandwidth, i.e., measurements for the 5MHz IF passband will be taken for the first through fifth RF frequenciesin the wideband RF response, then measurements for the second 5 MHz IFpassband will be taken for the second through sixth RF frequencies inthe wideband RF response, etc., until all narrowband measurements havebeen made for the BRT. Of course, other techniques for gathering thenarrowband data measurements and other bandwidths can be used as may bereasonably contemplated in the scope of the claims of the presentinvention. From these measurements, all 25 narrowband 200 kHz channelswill have coefficients accounted for in this data. The pre-defined BRTstorage location can be random access memory or flash memory preferablyresiding in the transceiver within a Transceiver Microprocessor Module(TMM) (90) or the DSPs 63 or 69 as previously described. Ideally, theTMM 90 is coupled between the receiver 51 and the transmitter 57 and canfacilitate the ability to easily interchange transceivers among variousbase station transceivers within a communication system. In this manner,a transceiver can retain the data locally as it is moved within a systemand can be further reprogrammed or flashed with new data as needed.

The automated BRTTS can also collect wideband flatness data for theentire allocated RF spectrum (60 MHz) of the specific BRT. This data isgathered for each possible channel tuning configuration for the 60 MHz.Measuring the coefficients for each possible channel tuningconfiguration preferably requires stepping through the entire 60 MHzwideband RF bandwidth from the lowest frequency values to the highestfrequency value at 200 kHz increments. As with the narrowbandmeasurements, other techniques for gathering the wideband data can beused as may be contemplated by the scope of the claims of the presentinvention. This data will identify the effect of placement within the 60MHz radio frequency spectrum alone on the transmit and receive power ofthe BRT, and will preferably provide 300 individual tuning channelcoefficients for the wideband response.

As previously described above, the collection of narrowband and widebandflatness data for the specific BRT that is measured accounts for theeffects on the transmit and receive power levels of the BRT caused by atleast one or more among the IF SAW filter, RF SAW filter, or otherphysical components in the BRT. Upon the determination of both of thenarrowband and wideband flatness data (coefficients) by the BRTTS, theBRTTS can program the entire BRT's coefficient configuration segmentinto a table in the BRT's flash memory (generally resident in the TMM)or other comparable memory device. Thus, on the whole, this flash memorycan store a BRT identifier, 25 narrowband channel coefficients, and 300wideband tuning channel coefficients per signal path. All of thisinformation can fit into one segment which can be identified ascorrelating to a specific BRT by using the BRT identifier. From thecombination of these two sets of coefficients for the narrowband andwideband amplitude response, the proper gain can be set for eachindividual RF frequency passband starting at any point in the widebandfrequency spectrum of a specific BRT.

Unlike with other existing broadband RF transceivers, gain is not addeduniformly for all BRTs in the BTS of the present invention, i.e., thecoefficient table is not comprised of solely narrowband coefficientaverages for a cross-section of BRTs. Each individual BRT used in anyBTS will have its own tailored BRT narrowband and wideband coefficienttables which will be unique to each BRT due to the myriad of variablesin such systems. This will allow for an exact amount of gain to be addedto the RF carriers received and transmitted by the BRT, and will allowfor nominal output level specifications to be met and maintained withmuch greater accuracy than previously allowed.

As discussed above, each BRT used in a BTS can have a TMM with flashmemory. This flash memory will store the narrowband and wideband RFcoefficients for that respective BRT, allowing the BRT to be swappedbetween BTSs without the necessary re-testing of the new BTS tocompensate for narrowband and wideband channel coefficients (because thecoefficients for the BRT will travel within the BRT itself). Thesechannel coefficients can then be downloaded by the BTS in which the BRTis installed for use in calculating the gain to be assigned to eachtransmit and receive channel in the BRT. Using transceiver specificvalues for both the narrowband and wideband effects on transmit andreceive level, the BTS in accordance with the present invention has theability to transmit and receive with a flatter amplitude response overfrequency.

In the description above, it should be understood that wideband RF andnarrowband IF coefficients must be independently collected for thetransmitter path and each individual diversity receiver path. Whileparticular embodiments of the present invention have been described, itshould be understood that other embodiments could be interpreted asbeing within the scope of the invention.

We claim:
 1. In a base station wideband transceiver capable of operatingin a wireless cellular communications system that communicates withmobile subscribers, a method for equalization in transmit and receivelevels, comprising the steps of: assigning a plurality of transmit andreceive carrier frequencies to the base station wideband transceiver;flattening a spectral response of said base station transceiver across arange of frequencies including the plurality of transmit and receivecarrier frequencies using software amplitude pre-distortion; wherein themethod further comprises the step of making narrowband IF channelmeasurements using an automated broadband radio frequency transceivertest (ABRFTT) to determine a set of coefficients for each narrowband IFchannel; wherein the ABRFTT further comprises the step of makingwideband RF channel measurements that step through the widebandbandwidth to determine a set of coefficients for the wideband RFchannel; wherein the ABRFTT creates 25 narrowband coefficients for a 5MHz IF bandwidth and 300 wideband coefficients for a 60 MHz RF bandwidthhaving 200 kHz channels.
 2. A method for equalizing a spectral responseof a wireless cellular base station transceiver configurable foroperating within any one of a plurality of relatively narrow segments ofa wireless communications band, comprising the steps of: storing ageneric set of coefficients representative of amplitude distortionsoccurring as a result of signal conversions between analog and digitalformats in said base station transceiver; storing at least one set oftransceiver specific coefficients representative of amplitudedistortions associated with a specific broadband base station RFtransceiver; and equalizing an amplitude response of said specificbroadband base station RF transceiver at a plurality of transmit andreceive carrier frequencies within a selected one of said segments usingsaid generic set of coefficients and said transceiver specificcoefficients to perform software amplitude pre-distortion.
 3. The methodaccording to claim 2 further comprising the step of selecting said atleast one set of transceiver specific coefficients to include a firstset of transceiver specific coefficients representative of amplitudedistortions exclusive to narrowband processing within said specificbroadband base station transceiver.
 4. The method according to claim 3further comprising the step of selecting said transceiver specificcoefficients to further include at least a second set of transceiverspecific coefficients representative of amplitude distortions associatedwith wideband signal processing within said specific broadband basestation transceiver.
 5. The method according to claim 4 furthercomprising the step of performing said software amplitude pre-distortionconcurrently using said first and second sets of transceiver specificcoefficients.
 6. A broadband wireless cellular base station transceiverconfigurable for operating within any one of a plurality of relativelynarrow segments of a wireless communications band, comprising; areceiver comprising at least one device for converting between an analogand a digital format; a memory device containing a generic set ofcoefficients representative of amplitude distortions occurring as aresult of signal conversions between analog and digital formats in saidbase station transceiver; a memory device containing at least one set oftransceiver specific coefficients representative of amplitudedistortions associated with said specific base station RF transceiver;and at least one digital signal processor programmed to equalize anamplitude response of said specific broadband base station RFtransceiver at a plurality of transmit and receive carrier frequencieswithin a selected one of said segments using said generic set ofcoefficients and said transceiver specific coefficients to performsoftware amplitude pre-distortion.
 7. The broadband wireless cellularbase station transceiver according to claim 6 wherein said at least oneset of transceiver specific coefficients includes a first set oftransceiver specific coefficients representative of amplitudedistortions exclusive to narrowband processing within said specificbroadband base station RF transceiver.
 8. The broadband wirelesscellular base station transceiver according to claim 7 wherein saidtransceiver specific coefficients further include at least a second setof transceiver specific coefficients representative of amplitudedistortions associated with wideband signal processing within saidspecific broadband base station RF transceiver.
 9. The broadbandwireless cellular base station transceiver according to claim 8 whereinsaid digital signal processor concurrently uses said first and secondsets of transceiver specific coefficients to perform said softwareamplitude predistortion.
 10. A base station wideband transceiver capableof operating in a wireless cellular communications system thatcommunicates with mobile subscribers, comprising: a receiver sectionthat is assigned a plurality of transmit and receive carrierfrequencies; a transmitter section configured to flatten a spectralresponse of said base station transceiver across a range of frequenciesincluding the plurality of transmit and receive carrier frequenciesusing amplitude pre-distortion; wherein the transmitter section isfurther configured to make narrowband IF channel measurements using anautomated broadband radio frequency transceiver test (ABRFTT) todetermine a set of coefficients for each narrowband IF channel; whereinthe ABRFTT is configured to make wideband RF channel measurements thatstep through the wideband bandwidth to determine a set of coefficientsfor the wideband RF channel; wherein the ABRFTT is further configured tocreate 25 narrowband coefficients for a 5 MHz IF bandwidth and 300wideband coefficients for a 60 MHz RF bandwidth having 200 kHz channels.11. In a base station wideband transceiver capable of operating in awireless cellular communications system that communicates with mobilesubscribers, a method for equalization in transmit and receive levels,comprising: assigning a plurality of transmit and receive carrierfrequencies to the base station wideband transceiver; flattening aspectral response of said base station transceiver across a range offrequencies including the plurality of transmit and receive carrierfrequencies using amplitude pre-distortion, wherein the method furthercomprises making narrowband IF channel measurements using an automatedbroadband radio frequency transceiver test (ABRFTT) to determine a setof coefficients for each narrowband IF channel, wherein the ABRFTTcomprises making wideband RF channel measurements that step through thewideband bandwidth to determine a set of coefficients for the widebandRF channel that is different in number from the set of coefficients foreach narrowband IF channel, and determining a gain to be assigned toeach transmit channel and each receive channel of the base stationwideband transceiver to achieve equalization in transmit and receivingpower levels using the set of coefficients for each narrowband IFchannel and the set of coefficients for the wideband RF channel incombination.
 12. A base station wideband transceiver capable ofoperating in a wireless cellular communications system that communicateswith mobile subscribers, comprising: a receiver section that is assigneda plurality of transmit and receive carrier frequencies; a transmittersection configured to flatten a spectral response of said base stationtransceiver across a range of frequencies including the plurality oftransmit and receive carrier frequencies using amplitude pre-distortion;wherein the transmitter section is further configured to make narrowbandIF channel measurements using an automated broadband radio frequencytransceiver test (ABRFTT) to determine a set of coefficients for eachnarrowband IF channel; wherein the ABRFTT is configured to make widebandRF channel measurements that step through the wideband bandwidth todetermine a set of coefficients for the wideband RF channel that isdifferent in number from the set of coefficients for each narrowband IFchannel; wherein the transmitter section is configured to use the set ofcoefficients for each narrowband IF channel and the set of coefficientsfor the wideband RF channel in combination to determine a gain to beassigned to each transmit channel and each receive channel of the basestation wideband transceiver to achieve equalization in transmit andreceive power levels.
 13. A wireless communications system accessible bymultiple wireless communicators, comprising: a plurality of base stationwideband transceivers capable of operating in a wireless communicationssystem accessible by mobile communicators, each of the plurality of basestation wideband transceivers comprising: a receiver section that isassigned a plurality of transmit and receive carrier frequencies; and atransmitter section configured to flatten a spectral response of thebase station wideband transceiver across a range of frequenciesincluding the plurality of transmit and receive carrier frequenciesusing amplitude pre-distortion; wherein the transmitter section isfurther configured to make narrowband IF channel measurements using anautomated broadband radio frequency transceiver test (ABRFTT) todetermine a set of coefficients for each narrowband IF channel; whereinthe ABRFTT is configured to make wideband RF channel measurements thatstep through the wideband bandwidth to determine a set of coefficientsfor the wideband RF channel; and wherein the ABRFTT is furtherconfigured to create 25 narrowband coefficients for a 5 MHz IF bandwidthand 300 wideband coefficients for a 60 MHz RF bandwidth having 200 kHzchannels and stores the narrowband and wideband coefficients in a memorydevice.
 14. The method according to claim 11, wherein the ABRFTT furthercomprises creating 25 narrowband coefficients for a 5 MHz IF bandwidthand 300 wideband coefficients for a 60 MHz RF bandwidth having 200 kHzchannels.
 15. The base station wideband transceiver according to claim12, wherein the ABRFTT is further configured to create 25 narrowbandcoefficients for a 5 MHz IF bandwidth and 300 wideband coefficients fora 60 MHz RF bandwidth having 200 kHz channels.
 16. The method accordingto claim 1, further comprising storing the set of coefficients for eachnarrowband IF channel and the set of coefficients for the wideband RFchannel in a storage within the base station wideband transceiver. 17.The base station wideband transceiver according to claim 10, furthercomprising a storage coupled between the receiver section and thetransmitter section and configured to store the set of coefficients foreach narrowband IF channel and the set of coefficients for the widebandRF channel.